slow dhcp on 1G backbone.

[Simon Hobson]

Glen R. J. Neff wrote:
>What kind of switch?  How are the ports configured?
>
>I know some Cisco switches will default to having trunking and
>channeling turned to auto by default, and having portfast turned off.
>Any of these can hinder DHCP's function.

Good point - I've seen slow or broken DHCP when switches have 
Spanning Tree set. When a device is connected, Spanning Tree will 
default to disabling traffic on the port while the switch learns the 
new topology - IIRC portfast (and Rapid Spanning tree on some 
switches) forces the port to active state at the slight risk of a 
temporary loop if the new device is another switch.

Some devices will give up on DHCP before the port is enabled for 
traffic, others will have dropped back to long retry periods.

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Simon Hobson

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